What is the default Jenkins password?

I'm using a EC2 server instance. Used the following to install Jenkins:

wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add -
sudo sh -c 'echo deb http://pkg.jenkins-ci.org/debian binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt-get update
sudo apt-get install jenkins

but I need to install software on the Jenkins server so in my EC2 instance I did

sudo –s –H –u jenkins

to get into the jenkins server. Then I tried to do

sudo cabal install quickcheck

but it prompted me for jenkins password. I've been searching around the internet for 4hrs now and nothing is helping me get administrative privilege in the jenkins server.

So I'm building my project using the following command in shell:

sudo cabal clean
sudo cabal configure
sudo cabal build
sudo cabal install

This is the error I'm getting:

 Started by timer
Building in workspace /var/lib/jenkins/jobs/Finance/workspace
Checkout:workspace / /var/lib/jenkins/jobs/Finance/workspace - hudson.remoting.LocalChannel@eea6dc
Using strategy: Default
Last Built Revision: Revision b638e2182dece0ef1a40232b1d75fa3ae5c01a5d (origin/master)
Fetching changes from 1 remote Git repository
Fetching upstream changes from origin
Commencing build of Revision b638e2182dece0ef1a40232b1d75fa3ae5c01a5d (origin/master)
Checking out Revision b638e2182dece0ef1a40232b1d75fa3ae5c01a5d (origin/master)
[workspace] $ /bin/sh -xe /tmp/hudson3500373817395137440.sh
+ sudo cabal clean
sudo: no tty present and no askpass program specified
Sorry, try again.
sudo: no tty present and no askpass program specified
Sorry, try again.
sudo: no tty present and no askpass program specified
Sorry, try again.
sudo: 3 incorrect password attempts
Build step 'Execute shell' marked build as failure
Sending e-mails to: ***@gmail.com
ERROR: Could not connect to SMTP host: localhost, port: 25
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
  nested exception is:
    java.net.ConnectException: Connection refused
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
    at javax.mail.Service.connect(Service.java:295)
    at javax.mail.Service.connect(Service.java:176)
    at javax.mail.Service.connect(Service.java:125)
    at javax.mail.Transport.send0(Transport.java:194)
    at javax.mail.Transport.send(Transport.java:124)
    at hudson.tasks.MailSender.execute(MailSender.java:116)
    at hudson.tasks.Mailer.perform(Mailer.java:117)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
    at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:814)
    at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:786)
    at hudson.model.Build$BuildExecution.post2(Build.java:183)
    at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:733)
    at hudson.model.Run.execute(Run.java:1592)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
    at hudson.model.ResourceController.execute(ResourceController.java:88)
    at hudson.model.Executor.run(Executor.java:237)
Caused by: java.net.ConnectException: Connection refused
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
    at java.net.Socket.connect(Socket.java:579)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:286)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
    ... 17 more
Finished: FAILURE

Solution 1:

Here is how you can fix it:

• Stop Jenkins
• Go go edit /var/lib/jenkins/config.xml
• Change <useSecurity>true</useSecurity> to false
• Restart Jenkins: sudo service jenkins restart
• Navigate to the Jenkins dashboard to the "Configure Security" option you likely used before. This time, setup security the same as before, BUT set it to allow anyone to do anything, and allow user signup.
• Go to www.yoursite.com/securityRealm/addUser and create a user
• Then go change allow anyone to do anything to whatever you actually want users to be able to do. In my case, it is allow logged in users to do anything.

Solution 2:

If you installed using apt-get in ubuntu 14.04, you will found the default password in /var/lib/jenkins/secrets/initialAdminPassword location.